Schweitzer Engineering Laboratories SEL-751 - Table 11.8 Relay Self-Tests

11.14
SEL-751 Relay Instruction Manual Date Code 20170927
Testing and Troubleshooting
Self-Test
Ta b l e 1 1 . 8 Re l ay S e l f-Tes t s (Sheet 1 of 3)
Self-Test Description Normal
Range
Protection
Disabled
on Failure
Alarm
Status
Auto
Message
on Failure
Front Panel
Message
on Failure
Corrective
Action
Watchdog Timer Periodic resetting
(1/32 cycle)
Yes De-
energized
No No
Main board FPGA (turn on)
Fail if mainboard Field Programmable
Gate Array does not accept program or
the version number is incorrect
Yes Latched Yes Status Fail
FPGA Failure
Automatic restart.
Contact SEL if
failure returns.
Main board FPGA (run time)
Fail on lack of data acquisition interrupts
or on detection of a CRC error in the
FPGA code
Yes Latched Yes Status Fail
FPGA Failure
Automatic restart.
Contact SEL if
failure returns.
GPSB (back-plane) communications
Fail if GPSB is busy on entry to
processing interval
Yes Latched Yes Status Fail
GPSB Failure
Automatic restart.
Contact SEL if
failure returns.
Front-Panel HMI (turn on)
Two-line display: Fail if ID registers do
not match or if FPGA programming is
unsuccessful
Touchscreen display: Automatic
diagnostics identify an issue
No Not
Latched
Yes NA
STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
External RAM (turn on)
Performs a read/write test on system
RAM
Yes Latched No No
External RAM (run time)
Performs a read/write test on system
RAM
Yes Latched Yes Status Fail
RAM Failure
Automatic restart.
Contact SEL if
failure returns.
Internal RAM (turn on)
Performs a read/write test on system
CPU RAM
Yes Latched No No
Internal RAM (run time)
Performs a read/write test on system
CPU RAM
Yes Latched Yes Status Fail
RAM Failure
Automatic restart.
Contact SEL if
failure returns.
Code Flash (turn on)
SELBOOT qualifies code with a
checksum
NA NA NA NA
Data Flash (turn on)
Checksum is computed on critical data
Yes Latched Yes Status Fail
Non_Vol Failure
Data Flash (run time)
Checksum is computed on critical data
Yes Latched Yes Status Fail
Non_Vol Failure
Critical RAM (settings)
Performs a checksum test on the active
copy of settings
Yes Latched Yes Status Fail
CR_RAM Failure
Automatic restart.
Contact SEL if
failure returns.
Critical RAM (run time)
Verify instruction matches FLASH
image
Yes Latched Yes Status Fail
CR_RAM Failure
Automatic restart.
Contact SEL if
failure returns.
I/O Board Failure
Check if ID register matches part number
Yes Latched Yes Status Fail
Card [C|D|E]
Failure
DeviceNet Board Failure
DeviceNet card does not respond in three
consecutive 300 ms time out periods
NA NA NA COMMFLT
Warning